Role of cysteine residues in ribonuclease H from Escherichia coli. Site-directed mutagenesis and chemical modification
Keyword(s):
The role of the three cysteine residues at positions 13, 63 and 133 in Escherichia coli RNAase H, an enzyme that is sensitive to N-ethylmaleimide [Berkower, Leis & Hurwitz (1973) J. Biol. Chem. 248, 5914-5921], was examined by using both site-directed mutagenesis and chemical modification. Novel aspects that were found are as follows. First, none of the cysteine residues is required for activity. Secondly, chemical modification of either Cys-13 or Cys-133 with thiol-blocking reagents inactivates the enzyme, but that of Cys-63 does not. Thus the sensitivity of E. coli RNAase H to N-ethylmaleimide arises not from blocking of the thiol group but from steric hindrance by the modifying group incorporated at either Cys-13 or Cys-133.
1988 ◽
Vol 263
(24)
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pp. 11646-11651
1991 ◽
Vol 266
(31)
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pp. 20709-20713
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1989 ◽
Vol 264
(14)
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pp. 8107-8112
2006 ◽
Vol 805
(1)
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pp. 585-589
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1994 ◽
Vol 180
(6)
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pp. 2147-2153
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